Revoking approvals and disconnecting from dApps

Both of these processes are different, below are the distinctions between them.

Wallet disconnection: This is removing the permission from a dApp which stops it from viewing your token balances, public wallet address, transactional activity in the past and permissions to halt initiating any transactions.

Approval & allowance revocation: This stops a dApp from accessing your wallet and its contents and moving around your assets.